He trained hard in puzzle-guessing, a sort of children’s game, all year, _____ still failed to reach his best form in all the tests given to both adults and children. 
#24453
A
Then      
B
Thus     
C
Therefore
D
Yet
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Alan is a careful driver, but he drives ______ of my friends.
#24837
A
more carefully
B
the most carefully
C
less carefully
D
the least carefully